Protection cover and light emitting device

Abstract

Safety of a user or the like is secured even when such malfunctions as a case that an optical system member has gone out of place occur. Provided is a protection cover which covers a light source device including a light source, an emitting section which is an optical system member that converts light of the light source into diffused light to emit the light, and a light receiving section that senses the light of the light source reflected by the emitting section. The protection cover which covers the light source device includes an opening arranged adjacent to the emitting section and having a shape that allows transmission of the emitted light and also that prevents a finger of a person from contacting the emitting section.

The invention claimed is: 
     
         1 . A distance measuring device, comprising:
 a light emitting device that includes:
 a light source device including:
 a light source configured to generate light; 
 an emitting section configured to:
 convert the generated light into diffused light; 
 emit the diffused light; and 
 
 a light receiving section configured to detect reflected light in the light source device, wherein the reflected light is associated with the generated light; and 
 
 a driving section configured to stop driving of the light source based on absence of the reflected light in the light source device; and 
 a protection cover configured to cover the light source device, wherein
 the protection cover includes an opening adjacent to the emitting section, and 
 the opening has a shape that:
 allows transmission of the emitted diffused light, and 
 prevents a finger of a person to be in contact with the emitting section. 
 
 
   
     
     
         2 . The distance measuring device according to  claim 1 , wherein
 the shape of the opening further prevents a probe to be in contact with the emitting section, and   the probe imitates the finger of the person.   
     
     
         3 . The distance measuring device according to  claim 1 , wherein the opening has a rectangular shape. 
     
     
         4 . The distance measuring device according to  claim 3 , wherein the opening, having the rectangular shape, has lengths of sides which are one of equal to or shorter than 4.6 mm. 
     
     
         5 . The distance measuring device according to  claim 1 , wherein the opening has a circular shape. 
     
     
         6 . The distance measuring device according to  claim 5 , wherein the opening, having the circular shape, has a diameter which is one of equal to or shorter than 5.1 mm. 
     
     
         7 . The distance measuring device according to  claim 1 , wherein a vertical distance between an end section of the opening and the emitting section is longer than 1 mm. 
     
     
         8 . The distance measuring device according to  claim 1 , wherein the opening has a tapered shape. 
     
     
         9 . The distance measuring device according to  claim 1 , wherein
 the protection cover includes a member, and   the member is configured to block the diffused emitted light.   
     
     
         10 . A light emitting device, comprising:
 a light source device including:
 a light source configured to generate light; 
 an emitting section configured to:
 convert the generated light into diffused light; 
 emit the diffused light; and 
 
 a light receiving section configured to detect reflected light in the light source device, wherein the reflected light is associated with the generated light; 
   a driving section configured to:
 detect an abnormality of the emitting section based on absence of the reflected light in the light source device; and 
 stop driving of the light source based on the detected abnormality; and 
   a protection cover configured to cover the light source device, wherein
 the protection cover includes an opening adjacent to the emitting section, 
 the opening has a shape that:
 allows transmission of the emitted diffused light, and 
 prevents a finger of a person to be in contact with the emitting section.